“…The control of nematode infections relies heavily on the use of anthelmintics. With the advent of anthelmintic-resistant nematode populations, there have been several calls for sustainable nematode control practices, which would protect the future use of current anthelmintic families (van Wyk and others 2006, Taylor 2012). Two important concepts have been introduced to study and promote the sustainable use of anthelmintics (Kenyon and Jackson 2012): targeted treatments (TT), where the whole flock/herd is treated based on knowledge of the risk, or parameters that quantify the severity of infection; and targeted selective treatments (TST), where only individual animals within the grazing group are treated, based on a single, or a combination of, treatment indicators, such as faecal egg count (FEC), weight gain, milk yield and body condition score.…”